Bytedance Inc.

Beijing Bytedance Network Technology Co., Ltd.

Microsoft Technology Licensing, LLC

Lemon Inc.

Microsoft Corporation

Bytdance Inc.

Jizheng Xu

Li Feng Zhang

Kai Zhang

Hongbin Liu

Yue Wang

Zhipin Deng

Weijia Zhu

Jian Li

Ye-Kui Wang

Feng Wu

Shipeng Li

Gary Joseph Sullivan

Hsiao Chiang Chuang

Li Zhang

Yang Wang

Bin Li

Jiahao Li

Ya-Qin Zhang

Cuiling Lan

Kui Fan

Xiulian Peng

Ruiqin Xiong

Lin Luo

Na Zhang

Chih-Lung Lin

Lihua Zhu

B Anil Kumar

You Zhou

Sridhar Sankuratri

Zixiang Xiong

Hao Xu

Yuwen He

Jiang Tao Li

Yan Huang

Dongdong Zhang

Yue Li

Li Song

Shiqi Wang

Keman Yu

Xiangyang Ji

Jaehong Chon

Tianliang Fu

Meng Wang

Jiexi Wang

Systems, methods and apparatus for video processing are described. The video processing may include video encoding, video decoding or video transcoding. One example method of video processing includes a method of video processing, including performing a conversion between a video region of a video and a bitstream of the video according to a format rule. The format rule specifies that an applicability of a deblocking filter for the video region is determined based on syntax elements at i) a picture parameter set level and ii) a picture level or a slice level.

Deblocking signaling in video coding

An example method of video processing includes determining, for a conversion between a current picture of a video and a coded representation of the video, a position of a reference sample in a reference picture that is associated with the current picture based on a top-left position of a window of a picture. The picture includes at least the current picture or the reference picture, and the window is subject to a processing rule during the conversion. The method also includes performing the conversion based on the determining.

Deriving reference sample positions in video coding

Embodiments of the present disclosure provide a solution for video processing. A method for video processing is proposed. The method comprises: determining, during a conversion between a target video block of a video and a bitstream of the video, an adjusted coding process for the target video block based at least in part on a budget of coding time for at least one further video block and an actual coding time for the at least one further video block, the at least one further video block being coded before the conversion, the coding time representing a time duration during which the at least one further video block being coded, the budget of coding time representing a time duration being pre-allocated for encoding the at least one further video block; and performing the conversion by using the adjusted coding process.

Method, apparatus, and medium for video processing

Devices, systems and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block according to a rule, where the rule specifies a relationship between applicability of a matrix based intra prediction (MIP) mode or a transform mode during the conversion, where the MIP mode includes determining a prediction block of the current video block by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation, and where the transform mode specifies use of a transform operation for the determining the prediction block for the current video block.

Transform coding based on matrix-based intra prediction

Devices, systems and methods for video processing are described. In a representative aspect, there is disclosed a method for video processing, including: determining, for a current video block, whether a first partition mode is applicable to the current video block in responsive to at least one condition, wherein the current video block is split into M sub-blocks in the first partition mode, and M>4; and performing a conversion for the current video block based on the determination.

Condition dependent video block partition

A method for implementing an adaptive color transform (ACT) during image/video encoding and decoding, includes determining, for a conversion between a video including a block and a bitstream of the video, that a size of the block is greater than a maximum allowed size for an ACT mode, and performing, based on the determining, the conversion, wherein, in response to the size of the block being greater than the maximum allowed size for the ACT mode, the block is partitioned into multiple sub-blocks, and wherein each of the multiple sub-blocks share a same prediction mode, and the ACT mode is enabled at a sub-block level.

General constraints information for video coding

Video coding and decoding methods are described. In example method includes performing a conversion between a current video block of a video and a bitstream representation of the current video block by determining a first intra coding mode to be stored which is associated with the current video block using a differential coding mode, where the first intra coding mode associated with the current video block is determined according to a second prediction mode used by the differential coding mode, and where, in the differential coding mode, a difference between a quantized residual of an intra prediction of the current video block and a prediction of the quantized residual is represented in the bitstream representation for the current video block using a differential pulse coding modulation (DPCM) representation.

Intra coded video using quantized residual differential pulse code modulation coding

Devices, systems and methods related to digital video coding, and specifically, to signaling of slice types in video picture headers are described. One example method of video processing includes performing a conversion between a video including one or more video pictures including one or more slices and a bitstream of the video, wherein the bitstream conforms to a format rule, and wherein the format rule specifies that for a video picture of the one or more video pictures having all slices coded as I slices, P slice and B slice related syntax elements are omitted from a picture header for the video picture.

Signaling of slice types in video pictures headers

A method of visual media processing includes determining a size of a buffer to store reference samples for prediction in an intra block copy mode; and performing a conversion between a current video block of visual media data and a bitstream of the current video block, using the reference samples stored in the buffer, wherein the conversion is performed in the intra block copy mode which is based on motion information related to a reconstructed block located in same video region with the current video block without referring to a reference picture.

Buffer resetting for intra block copy in video coding

A method includes determining, for a conversion between a video block of a video and a bitstream of the video, a size of prediction block corresponding to the video block according to a rule. The method also includes performing the conversion based on the determining. The rule specifies that a first size of the prediction block is determined responsive to whether a prediction refinement using optical flow technique is used for coding the video block. The video block has a second size and is coded using an affine merge mode or an affine advanced motion vector prediction mode.

Prediction refinement for affine merge and affine motion vector prediction mode

A video processing method includes determining, for a conversion between a block of a video and a bitstream representation of the video, that a secondary transform with a reduced dimension dimension (e.g., an inverse low frequency non-separable transform) is applicable to a single sub-block of the block in case a dimension of the block satisfies a condition. The secondary transform is performed between a forward primary transform and a quantization step or between a de-quantization step and an inverse primary transform. The reduced dimension is reduced from a dimension of the block. The method also includes performing the conversion based on the determining.

Use of secondary transform in coded video

An example method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, whether to enable usage of a chroma quantization parameter (QP) offset for the current block according to a syntax element at a level of a video unit. The video unit includes the current block and a second block of the video. The method also includes performing the conversion based on the determining.

Chroma quantization parameter in video coding

One example method of video processing includes implementing, by a processor, a decoder-side motion vector derivation (DMVD) scheme for motion vector refinement during a conversion between a current video block and a bitstream representation of the current video block by deriving parameters based on a deriving rule. The conversion may include compressing the current video block into the bitstream representation or uncompressing the bitstream representation into pixel values of the current video block.

Decoder side motion derivation based on processing parameters

A method for video processing is described. The method may include making a decision, for a conversion between a current video block of a video picture of a video and a coded representation of the video, regarding a size of a reference region of the video picture from which reference samples are used for predicting the current video block, based on a size of a virtual pipeline data unit (VPDU), a size of a coding tree block (CTB), or a size of a coding tree unit (CTU); and performing the conversion based on the decision.

Size restriction for intra-block copy virtual buffer

Devices, systems, and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes encoding a current video block of a video using a matrix intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and selectively followed by an upsampling operation; and adding, to a coded representation of the current video block, a syntax element indicative of applicability of the MIP mode to the current video block using arithmetic coding in which a context for the syntax element is derived based on a rule.

Context coding for matrix-based intra prediction

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Jizheng Xu